Travel Triangle — Quote changed after payment, want to cancel and need refund

I booked my trip for Dec 22 with adventure mania through Travel Triangle. Initial quote requested for 7 days was provided for 2 adults and 1 kid as requested. When we asked them to cutr Shimla off and provide a shorter itinerary, they gave us a quote which we accepted and paid 50%. Now adventure mania says the latter quote was only for 2 adults and we need to pay 40% more. This is a mistake of adventure mania that they are not accepting and Travel Triangle not picking/returning my calls. I need a complete reimbursement as this is not my mistake
Booking Id: 9928215